Hello, friend!
Note the information on the device nameplate. The Wi-Fi of the device does not have a password at first. If you forget the Wi-Fi password of the device, you can press and hold the button for more than 3 seconds to reset the device. The E5576-855 is a CPE consumer device and the device is preconfigured. After the device is reset, the network recovers automatically after the SIM card is inserted.

Thanks!